Replace the GistID with your gist id number, shown at the top of the gist you created (or gist you found and want to share with the world).

My own example

When I first started using Emacs I created a basic init.el configuration for Clojure. This loads all the base packages you need for making Emacs 24 Clojure aware in one init.el file. If you drop this init.el file into your ~/.emacs.d/ folder and run Emacs 24 for the first time then all the necessary packages will be automatically downloaded and added Emacs.

In Summary

Using Github Gists in your blog post is a simple way to view code in a consistent way, at the same time providing a simple way to share code and configuration with others.

Some blogging platforms like Hexo make it easy to add Gists, some like Blogger require way too much encouragement.